Cummins Westport Heavy-Duty Natural Gas Engines

Cummins Westport Inc. designs, engineers, and markets 6 to 12 litre spark-ignited automotive natural gas engines for commercial transportation applications such as truck and buses. Our dedicated 100% natural gas engines are manufactured by Cummins and available as a factory-direct option from leading truck and bus manufacturers. 

Cummins Westport natural gas engines are based on the proven line of Cummins diesel engines, and share many of the same components. They are built in Cummins factories in Rocky Mount, North Carolina and Jamestown, New York.

More than 80,000 Cummins Westport engines are in service worldwide. Designed to meet the most stringent emissions regulations, they provide efficient and reliable service.

Cummins Westport natural gas engines are certified with catalyst. They meet or exceed the toughest emissions standards including the U.S. Environmental Protection Agency (EPA), California Air Resources Board (CARB), and EURO emissions standards.

Leader in natural gas engine development

Cummins Westport was formed in 2001 as a 50:50 joint venture between Cummins Inc. and Westport Innovations. Cummins Westport has approximately 80 employees. Engineering and customer support staff are located in Columbus, IN. Sales, marketing, and management staff are based in the USA and Canada. 

Cummins Inc. (NYSE:CMI), is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems.  Westport Innovations Inc. (NASDAQ and TSX:WPRT) is, a leading developer of technologies that allow engines to operate on clean-burning natural gas. 

Cummins Inc. produced its first natural gas heavy-duty engine in 1991. The company has continued to develop clean, leading-edge natural gas engine technology. Cummins engines met enhanced emissions standards in advance of regulated deadlines. 

Natural gas: clean, renewable energy

Natural gas, or methane, is one of the cleanest, safest and most useful forms of energy. It has a number of distinct advantages:

  • Simple chemical make-up: one atom of carbon and four atoms of hydrogen (CH4).
  • Burns cleanly: with the highest hydrogen-to-carbon ratio of any hydrocarbon, natural gas produces less greenhouse gases and particulate matter (i.e. soot).  
  • Plentiful resource: natural gas is abundant in North America and worldwide. Biomethane (renewable natural gas) produced from landfill gas, food and animal wastes, also contributes to this abundant supply of clean, renewable energy.

Dedicated natural gas engines

Cummins Westport engines range from 5.9 to 11.9 liters with 195 hp [145 kW] to 400 hp [298 kW].

North America

  • The 250-320 hp ISL G is for applications such as transit and school bus, and medium and heavy duty truck applications, including refuse, recycling, sweeper, mixer, dump truck and other vocational applications.  The new ISL G Near Zero features 90% lower NOx emissions than the current EPA NOx limit of 0.2 g/bhp-hr.  
  • The ISX12 G is designed for regional haul truck / tractor, vocational, and refuse applications.  The ISX12 G offers ratings from 320 to 400 hp and 1,450 lb-ft torque, optional engine brake, and manual and automatic transmission.
  • The ISB6.7 G is a midrange natural gas engine for school bus, shuttle, transit, medium-duty truck, and vocational vehicle markets.  Based on the Cummins ISB6.7 diesel platform, the Cummins Westport ISB6.7 G offers up to 240 hp (179W) and 560 lb-ft (759 Nm) of torque.

Outside of North America

  • The C Gas Plus and B Gas Plus for applications such as transit, bus and medium duty trucks.

Cummins Westport engines are designed to operate on natural gas or renewable natural gas (RNG) or Biomethane that is stored on the vehicle as compressed natural gas (CNG), or liquefied natural gas (LNG). 

Based on Cummins' proven and reliable diesel platforms, Cummins Westport engines are built in the same manufacturing plants that manufacture Cummins diesel engines. They are available factory-direct from leading truck and bus manufacturers worldwide.

Warranty, service and aftermarket support are provided by the global Cummins distributor and dealer network.

Benefits for the environment and the bottom line

Increasingly, businesses are seeing the value of low emission, high performing natural gas engines—for both the environment and for their bottom line.

Cummins Westport natural gas engines offer:

  • Clean, quiet, and reliable performance
  • Low emissions
  • Improved efficiency and lower total fuel costs
  • Less reliance on imported oil
  • Parts, warranty and support via Cummins’ worldwide distributor and service dealer network